Engineering Worksheet: Friction

Engineering lesson 10: Friction · Set 697 · 40 questions

Engineer's tip (Rough grips, smooth slides): More friction: rough, dry, grippy. Less friction: smooth, oiled, wet, icy, rolling, powdered. Helpful for grip and braking; a problem when it wears or heats parts. Friction test: bigger force needed → more friction.

1. 1.🛞 More or less friction: sand on a slippery path? (a) more friction (b) less friction
2. 2.🔍 Which is the odd one out? (a) chalk on a gym bar (b) a smooth steel slide (c) a tyre with deep treads (d) a grippy rubber sole
3. 3.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 10 N, ice 4 N, a glass sheet 5 N, a wooden plank 8 N. Which surface gave the most friction? (a) ice (b) a wooden plank (c) a carpet (d) a glass sheet
4. 4.🛞 Is friction helpful or a problem here: striking a matchstick? (a) a problem (b) helpful
5. 5.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, a glass sheet 3 N, a wooden plank 5 N, a carpet 8 N. How many newtons more were needed on sandpaper than on a glass sheet?
6. 6.🛞 More or less friction: a wet tiled floor? (a) more friction (b) less friction
7. 7.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 7 N, ice 2 N. Which surface gave the least friction? (a) ice (b) a wooden plank (c) a glass sheet (d) a carpet
8. 8.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 6 N, a carpet 10 N, ice 2 N. How many newtons more were needed on a carpet than on ice?
9. 9.🛞 More or less friction: powder on a carrom board? (a) more friction (b) less friction
10. 10.🔍 Which is the odd one out? (a) a rough doormat (b) a wheel on ball bearings (c) a box pushed on carpet (d) a tyre with deep treads
11. 11.🛞 Friction acts … (a) only upwards (b) only on ice (c) against the motion (d) with the motion
12. 12.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 12 N, ice 4 N, a glass sheet 7 N, a wooden plank 10 N. How many newtons more were needed on sandpaper than on ice?
13. 13.🛞 Is friction helpful or a problem here: writing with a pencil? (a) a problem (b) helpful
14. 14.🛞 Is friction helpful or a problem here: machine parts heating up? (a) a problem (b) helpful
15. 15.🔍 Which is the odd one out? (a) a wet tiled floor (b) a smooth steel slide (c) sand on a slippery path (d) oil on a squeaky hinge
16. 16.🔍 Which is the odd one out? (a) skating on ice (b) chalk on a gym bar (c) a smooth steel slide (d) a wet tiled floor
17. 17.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 7 N, sandpaper 11 N, a glass sheet 3 N, a wooden plank 6 N. How many newtons more were needed on sandpaper than on a glass sheet?
18. 18.True or false: chalk on a gym bar gives more friction. (a) False (b) True
19. 19.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 14 N, ice 4 N, a glass sheet 7 N, a wooden plank 10 N. Which surface gave the least friction? (a) a glass sheet (b) ice (c) a wooden plank (d) sandpaper
20. 20.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: ice 3 N, a glass sheet 7 N, a wooden plank 9 N, a carpet 13 N. Which surface gave the least friction? (a) a carpet (b) a glass sheet (c) ice (d) a wooden plank
21. 21.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 5 N, a carpet 9 N, sandpaper 12 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
22. 22.🛞 Is friction helpful or a problem here: a door hinge squeaking? (a) a problem (b) helpful
23. 23.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 3 N, a wooden plank 4 N, sandpaper 8 N, ice 1 N. How many newtons more were needed on sandpaper than on ice?
24. 24.🔍 Which is the odd one out? (a) skating on ice (b) a box pushed on carpet (c) a tyre with deep treads (d) chalk on a gym bar
25. 25.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a wooden plank 6 N, sandpaper 8 N, ice 2 N. Which surface gave the least friction? (a) a glass sheet (b) a wooden plank (c) ice (d) sandpaper
26. 26.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 5 N, ice 1 N, a glass sheet 2 N, a carpet 4 N. How many newtons more were needed on sandpaper than on ice?
27. 27.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a carpet 8 N, sandpaper 12 N, ice 4 N, a glass sheet 7 N. Which surface gave the least friction? (a) a carpet (b) ice (c) a glass sheet (d) sandpaper
28. 28.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 2 N, a carpet 6 N, sandpaper 9 N. How many newtons more were needed on sandpaper than on a glass sheet?
29. 29.True or false: a box pushed on carpet gives more friction. (a) True (b) False
30. 30.True or false: a grippy rubber sole gives more friction. (a) False (b) True
31. 31.🔍 Which is the odd one out? (a) powder on a carrom board (b) oil on a squeaky hinge (c) a wet tiled floor (d) a rough doormat
32. 32.🛞 Is friction helpful or a problem here: gripping a cricket bat? (a) a problem (b) helpful
33. 33.🛞 Why are tyres made with deep treads? (a) to look nice (b) to save rubber (c) to go slower (d) to grip the road
34. 34.🛞 Is friction helpful or a problem here: shoe soles wearing out? (a) a problem (b) helpful
35. 35.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a wooden plank 4 N, a carpet 6 N, sandpaper 10 N, a glass sheet 3 N. Which surface gave the most friction? (a) sandpaper (b) a glass sheet (c) a wooden plank (d) a carpet
36. 36.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 1 N, a wooden plank 5 N, a carpet 7 N, sandpaper 9 N. Which surface gave the most friction? (a) a carpet (b) a glass sheet (c) a wooden plank (d) sandpaper
37. 37.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 11 N, ice 4 N, a glass sheet 8 N, a carpet 10 N. How many newtons more were needed on sandpaper than on ice?
38. 38.🛞 How can we reduce friction in a machine? (a) make parts rough (b) press parts harder (c) oil the moving parts (d) add sand
39. 39.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: sandpaper 9 N, a glass sheet 2 N, a wooden plank 4 N, a carpet 7 N. How many newtons more were needed on sandpaper than on a glass sheet?
40. 40.🛞 The same block is pulled at a steady speed across four surfaces. The forces needed were: a glass sheet 4 N, a carpet 5 N, sandpaper 8 N, ice 2 N. How many newtons more were needed on sandpaper than on ice?

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